netdev - Re: [Intel-wired-lan] [PATCH iwl-next v3] igb: Retrieve Tx timestamp directly from interrupt for i210

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Message-ID: <willemdebruijn.kernel.459b2672b1e7@gmail.com>
Date: Thu, 05 Feb 2026 16:41:03 -0500
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>, 
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
 Willem de Bruijn <willemb@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, 
 Eric Dumazet <edumazet@...gle.com>, 
 "David S. Miller" <davem@...emloft.net>
Cc: "Loktionov, Aleksandr" <aleksandr.loktionov@...el.com>, 
 Kurt Kanzenbach <kurt@...utronix.de>, 
 "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>, 
 "Kitszel, Przemyslaw" <przemyslaw.kitszel@...el.com>, 
 Paul Menzel <pmenzel@...gen.mpg.de>, 
 "Gomes, Vinicius" <vinicius.gomes@...el.com>, 
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>, 
 Richard Cochran <richardcochran@...il.com>, 
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>, 
 "Keller, Jacob E" <jacob.e.keller@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH iwl-next v3] igb: Retrieve Tx timestamp
 directly from interrupt for i210

Vadim Fedorenko wrote:
> On 05/02/2026 16:43, Sebastian Andrzej Siewior wrote:
> > On 2026-02-05 16:27:03 [+0000], Vadim Fedorenko wrote:
> >>> So the only thing that bothers me is the read_lock_bh() in
> >>> skb_may_tx_timestamp() which deadlocks if the socket is write-locked on
> >>> the same CPU.
> >>
> >> Alright. Now you make me think whether we should enforce OPT_TSONLY
> >> option on socket which doesn't have CAP_NET_RAW? Then we can get rid of this
> >> check, and in case sysctl was flipped off - drop TX timestamps as
> >> it's done now?
> > 
> > This would "fix" this problem for all users which do deliver the
> > timestamp from their IRQ handler instead of napi. There are a few of
> > those…
> > This would be considered stable material, right? (despite the fact that
> > we have it for quite some time and nobody complained so far).
> 
> cc: Willem as he is the author of the check introduced back in 2015.
> 
> But it's more like a question to maintainers whether it is acceptable
> way of "fixing" drivers or it's no-go solution

Requiring OPT_TSONLY unless CAP_NET_RAW would break legacy users.